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Finding the Fourth Proportional to 125.10, 172.71 and 101.40

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Solution

The fourth proportional to 125.10, 172.71 and 101.40 is: 139.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.10 : 172.71 = 101.40 : x
  2. Step 2: Convert to fraction form
    125.10/172.71 = 101.40/x
  3. Step 3: Cross multiply
    125.10x = 172.71 × 101.40
  4. Step 4: Simplify right side
    125.10x = 17,512.79
  5. Step 5: Solve for x
    x = 17,512.79/125.10
  6. Step 6: Final answer
    x = 139.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.